Label deployment and pod with app.kubernetes.io/version

[mloskot]

Describe the solution you'd like

The chart already generates a bunch of well-known and recommended Kubernetes labels:

helm-kubernetes-services/charts/k8s-service/templates/_deployment_spec.tpl

Lines 88 to 90 in 8a50e60

	app.kubernetes.io/name: {{ include "k8s-service.name" . }}
	app.kubernetes.io/instance: {{ .Release.Name }}
	app.kubernetes.io/managed-by: {{ .Release.Service }}

It seems reasonable to allow users feed the chart with values for additional well-known labels like app.kubernetes.io/version

Describe alternatives you've considered

It is possible to inject the requested app.kubernetes.io/version label with additionalDeploymentLabels and additionalPodLabels, but allowing users to specify version as a dedicated Helm value seems reasonable in the spirit of all app.kubernetes.io labels or none.

Additional context

n/a